**Q1.** What do you mean by *z*-transform of the discrete signal *x*(*n*)?

**Ans.:** The *z*-transform of discrete time signal *x*(*n*) and it is given by

where *z* is the complex variable and the *z*-transform of *x*(*n*) is also represented by the operator *Z* i.e.,

Here *X*(*Z*) and *x*(*n*) are known as *z*-transform pair which is represented as

**Q2.** What do you mean by Region of Convergence?

**Ans.:** The region of convergence are the values of *z* for which the *z*-transform converges. Eq. (6.1) shows that *z*-transform is an infinite ...

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